The examiner will know it way better than you do, so he/she will see right through it if you try and BS it. Admit to not knowing it, and try to look it up if you are given the opportunity (you will have to ask). The best advice I was ever given before any of my checkrides was to eat a good dinner the night before (something that will fill you up), and have a decent breakfast. Show up early and have everything ready to go when the examiner gets there. As Mic already stated, you will have to give them a reason to bust you, so don't start it off early by showing up un/under prepared.